Energy

Energy is among the highly rated IQ boosting brain games for kids and for adults equally. The gameplay is simple and offers a lot of addictive and engaging themes. It is one of the most downloaded brain games for brain exercises too.
The concept is simple, you just have to tap the lines to rotate and create connected loops. The wires will shine when at least one bolt and a lamp are connected through a line.

It's so relaxing that, people having OCD are advised to play it at least once per day to relax their minds and fight anxiety issues. It is one of the best games online you must try for your brain in 2021